Didj and Explorer SDL mixer

From eLinux.org
Revision as of 18:16, 16 September 2010 by Reggie (Talk | contribs) (Created page with "'''Installing SDL_mixer''' Another short tutorial for installing SDL_mixer, this will give better audio support to SDL which only has wav/pcm support built in. This tutorial wi...")

(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Installing SDL_mixer

Another short tutorial for installing SDL_mixer, this will give better audio support to SDL which only has wav/pcm support built in. This tutorial will show you how to install SDL_mixer with mp3 support using libmad.


Prerequisites


A working toolchain
LX Kernel sources and ThirdParty tarball unpacked to your harddrive
correct environment variables set 
libmad (installed as part of this tutorial)
libSDL (should already be installed)
A working internet connection

Installing libmad


As with the other tutorials, we will need to make a directory in PROJECT_PATH/packages:

mkdir $PROJECT_PATH/packages/SDLmixer
cd $PROJECT_PATH/packages/SDLmixer

This install is slightly different, we need to disable one of the libmad optimisation options, so we need to download the SDL_mixer source and edit it:

wget ftp://ftp.mars.org/pub/mpeg/libmad-0.15.1b.tar.gz
tar -xf libmad-0.15.1b.tar.gz
cd ./libmad-0.15.1b
gedit configure

Look for line 19102 and comment it out:

//	    optimize="$optimize -fforce-mem"

now save it into your PROJECT_PATH/SDLimage folder, we will use it in a moment when we install libmad.


We now need to make an install script for libmad, copy the following into a text editor and save the file as installmad.sh:

#!/bin/bash
export CC=arm-linux-uclibcgnueabi-gcc
export CXX=arm-linux-uclibcgnueabi-gcc
export CPPFLAGS='-I${PROJECT_PATH}/packages/SDLmixer/libmad-0.15.1b -I${PROJECT_PATH}/packages/zlib/zlib-1.2.3'
export LDFLAGS='-L${PROJECT_PATH}/packages/SDLmixer/libmad-0.15.1b -L${PROJECT_PATH}/packages/zlib/zlib-1.2.3'
if [ "$CLEAN" == "1" ]; then
rm -rf ./libmad-0.15.1b
wget ftp://ftp.mars.org/pub/mpeg/libmad-0.15.1b.tar.gz
tar -xf libmad-0.15.1b.tar.gz
cp -f configure ./libmad-0.15.1b
cd ./libmad-0.15.1b
make clean
fi
if [ ! "$CLEAN" == "1" ]; then
cd ./libmad-0.15.1b
fi
./configure --prefix=${ROOTFS_PATH}/usr --build=`uname -m` --host=arm-linux --enable-fpm=arm --enable-shared
make -j3
make -j3 install


Make the install script executable, then you can now install it by the following command:

chmod a+x installmad.sh
CLEAN=1 ./installmad.sh


that should install the appropriate headers and libs into ROOTFS_PATH/usr/include and /lib respectively.


You can now get on with preparing an install.sh file for SDL_mixer, so once again, copy and paste the following into your favourite text editor:

#!/bin/bash
export CFLAGS='-I${ROOTFS_PATH}/usr/include -I${ROOTFS_PATH}/usr/include/SDL'
export LD_FLAGS='-L${ROOTFS_PATH}/usr/lib'
export CC=arm-linux-uclibcgnueabi-gcc
export CXX=arm-linux-uclibcgnueabi-g++ 
if [ "$CLEAN" == "1" ]; then
rm -rf ./SDL_mixer-1.2.11
rm ./SDL_mixer-1.2.11.tar.gz
wget http://www.libsdl.org/projects/SDL_mixer/release/SDL_mixer-1.2.11.tar.gz
tar -xf SDL_mixer-1.2.11.tar.gz
fi
cd ./SDL_mixer-1.2.11
./configure --prefix=${ROOTFS_PATH}/usr --build=`uname -m` --host=arm-linux --enable-shared --enable-music-wave --enable-music-mp3-mad-gpl --disable-music-mp3 --disable-smpegtest --disable-music-mod --libdir=${ROOTFS_PATH}/usr/lib --includedir=${ROOTFS_PATH}/usr/include --with-sdl-prefix=${ROOTFS_PATH}/usr/
make -j3
make -j3 install


name the file install.sh save the file to PROJECT_PATH/packages/SDLmixer.

now Make the script executable, compile and install the SDL_mixer library, type the following at the command line:

chmod a+x install.sh
CLEAN=1 ./install.sh


Once that has finished you should have the library files and the headers in the $ROOTFS_PATH/usr/lib and /include folders.

to compile an app do something like:

arm-linux-uclibcgnueabi-gcc -o mysdlApp mysdlApp.c -I/home/didj/Source/kernel/explorer/rootfs/usr/include/ -L/home/didj/Source/kernel/explorer/rootfs/usr/lib -lSDL -lSDL_mixer -lmad -lpthread

and don't forget to include the SDL_mixer.h file in your app:

#include "SDL/SDL_mixer.h"